ReadJDBC converted to use reflection

ReadJDBC and WriteJDBC converted to use reflection; also the latest version of MySQL is downloaded from Maven - this approach does have certain disadvantages, so we will be researching other altenatives. See https://stackoverflow.com/questions/64434180/i-want-to-use-mysql-using-reflection-but-have-had-to-hard-code-the-mysql-jar-fi

This removes MySQL and ProtoBuf from the jar file - download this version to save space (about 11Mb down to about .5 Mb)